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Our Spec 3 Tubular Manifold and Up-Pipe for the Subaru Impreza replaces the restrictive standard cast iron manifold and improves exhaust gas flow thanks to its stainless steel, CAD-designed construction. You will also benefit improved throttle response and increased power output.Features:Constructed from T304 stainless steelUnequal length header pipes3 bolt Up-Pipe flangeImproved throttle response and gas flowGaskets includedPlease note: due to 3 bolt Up-Pipe flange this manifold can't be used with the standard Up-Pipe and must be used in conjunction with the supplied Up-Pipe.